CN216083238U - Fixed focus lens - Google Patents
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- CN216083238U CN216083238U CN202122502616.7U CN202122502616U CN216083238U CN 216083238 U CN216083238 U CN 216083238U CN 202122502616 U CN202122502616 U CN 202122502616U CN 216083238 U CN216083238 U CN 216083238U
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Abstract
The present invention relates to a fixed focus lens including, in order from an object side to an image side along an optical axis, a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having negative power, a fourth lens (L4) having positive power, a fifth lens (L5) having negative power, a sixth lens (L6) having positive power, a seventh lens (L7) having positive power, an eighth lens (L8) having negative power, a ninth lens (L9) having positive power, and a tenth lens (L10) having positive power. The fixed-focus lens has the characteristics of large angle, high pixel, low distortion and small volume, and does not generate virtual focus within the temperature range of-20-60 ℃.
Description
Technical Field
The utility model relates to the technical field of optical imaging, in particular to a fixed-focus lens.
Background
With the development and production needs of society, remote video and network conferences are widely concerned by various circles because they are not restricted by time and place and have extremely high information exchange convenience. The imaging lens is an indispensable and important device in a video conference, and the imaging quality of the imaging lens determines the upper limit of a video conference picture. However, with the increase of the visual angle, the distortion of the existing imaging lens is increased, which leads to high distortion of the human image. Therefore, how to design a lens with a large angle and no distortion becomes an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a fixed-focus lens.
In order to achieve the above object of the present invention, the present invention provides a fixed focus lens including a first lens having negative refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, a seventh lens having positive refractive power, an eighth lens having negative refractive power, a ninth lens having positive refractive power, and a tenth lens having positive refractive power, which are arranged in this order from an object side to an image side along an optical axis.
According to an aspect of the present invention, the first lens element is a convex-concave lens element, the second lens element is a convex-concave lens element, the third lens element is a biconcave lens element, the fourth lens element is a biconvex lens element, the fifth lens element has a concave object-side surface, the sixth lens element is a biconvex lens element, the seventh lens element is a biconvex lens element, the eighth lens element is a biconcave lens element, the ninth lens element is a biconvex lens element, and the tenth lens element has a convex image-side surface.
According to one aspect of the present invention, the seventh lens and the eighth lens are cemented to constitute a cemented lens group having a negative power.
According to one aspect of the present invention, the fourth lens and the fifth lens are cemented to form a cemented lens group.
According to one aspect of the present invention, the third lens and the fourth lens are cemented to form a cemented lens group.
According to one aspect of the utility model, further comprising an optical stop, the optical stop being located between the fifth lens and the sixth lens.
According to an aspect of the present invention, a focal length f4 of the fourth lens and a focal length f6 of the sixth lens satisfy the following relationship: the absolute value of f4/f6 is more than or equal to 0.60 and less than or equal to 1.00.
According to an aspect of the present invention, the aperture D1 of the first lens and the total length T of the prime lens satisfy the following relationship: D1/T is more than or equal to 0.48 and less than or equal to 0.60.
According to one aspect of the utility model, the refractive index n1 of the first lens is greater than 1.65.
According to an aspect of the utility model, said fourth lens has an abbe number vd4 smaller than 30.
According to an aspect of the utility model, said seventh lens has an abbe number vd7 larger than 80.
According to an aspect of the utility model, the refractive index n8 of the eighth lens is larger than 1.80.
According to an aspect of the utility model, said tenth lens has an abbe number vd10 smaller than 25.
According to one aspect of the utility model, at least four surfaces are aspheric.
According to an aspect of the utility model, the object-side surface and the image-side surface of the second lens are both aspheric.
According to the concept of the utility model, the wide-angle fixed-focus glass-plastic hybrid lens has the advantages of large angle, high pixel, low distortion, small volume and no virtual focus within the temperature range of-20-60 ℃.
According to one scheme of the utility model, the imaging quality of the fixed-focus lens can be effectively improved by reasonably setting the relationship between the focal lengths of the fourth lens and the sixth lens.
According to one scheme of the utility model, the relationship between the aperture of the first lens and the total length of the lens is reasonably set, so that the volume of the lens can be effectively reduced, and the miniaturization is realized.
According to an aspect of the present invention, by making the refractive index of the first lens larger than a certain value, the lens aperture can be reduced and the influence of distortion can be reduced.
According to an aspect of the present invention, the abbe number of the fourth lens and the abbe number of the tenth lens are respectively smaller than a certain value by using the anomalous dispersion material, so that chromatic aberration of an image can be effectively corrected.
According to an aspect of the present invention, by making the abbe number of the seventh lens larger than a certain value, the chromatic dispersion of the lens can be effectively improved.
According to one scheme of the utility model, the refractive index of the eighth lens is larger than a certain value, so that tolerance sensitivity can be effectively reduced, and the yield is improved.
According to one aspect of the present invention, at least four surfaces in the fixed focus lens are aspheric, so that aberrations can be corrected by using multivariate aspheric surfaces, and the performance of high-temperature and low-temperature environments can be balanced.
Drawings
Fig. 1 is a schematic diagram showing a construction of a fixed focus lens according to a first embodiment of the present invention;
fig. 2 schematically shows an MTF chart of a fixed-focus lens according to a first embodiment of the present invention;
fig. 3 schematically shows a distortion diagram of a fixed focus lens according to a first embodiment of the present invention;
FIG. 4 is a diagram schematically showing a defocus curve of the prime lens of the first embodiment of the present invention at a temperature of-20 ℃;
FIG. 5 is a diagram schematically showing a defocus graph of a fixed focus lens according to a first embodiment of the present invention at a high temperature of 60 ℃;
fig. 6 is a schematic diagram showing a construction of a fixed focus lens according to a second embodiment of the present invention;
fig. 7 schematically shows an MTF chart of a fixed-focus lens according to a second embodiment of the present invention;
fig. 8 is a diagram schematically showing distortion of a fixed focus lens according to a second embodiment of the present invention;
FIG. 9 is a diagram schematically showing a defocus curve of a fixed focus lens of a second embodiment of the present invention at a temperature of-20 ℃;
fig. 10 schematically shows a defocus graph of a fixed focus lens of a second embodiment of the present invention at a high temperature of 60 ℃;
fig. 11 is a schematic diagram showing a construction of a fixed focus lens according to a third embodiment of the present invention;
fig. 12 schematically shows an MTF chart of a fixed-focus lens according to a third embodiment of the present invention;
fig. 13 is a diagram schematically showing distortion of a fixed focus lens according to a third embodiment of the present invention;
FIG. 14 is a diagram schematically showing a defocus graph of a fixed focus lens of a third embodiment of the present invention at a low temperature of-20 ℃;
fig. 15 schematically shows a defocus graph of a fixed focus lens according to a third embodiment of the present invention at a high temperature of 60 ℃.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1, the fixed focus lens of the present invention includes, in order from an object side to an image side along an optical axis, a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having negative power, a fourth lens L4 having positive power, a fifth lens L5 having negative power, a sixth lens L6 having positive power, a seventh lens L7 having positive power, an eighth lens L8 having negative power, a ninth lens L9 having positive power, and a tenth lens L10 having positive power.
In the present invention, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a biconcave lens, the fourth lens L4 is a biconvex lens, the object-side surface of the fifth lens L5 is a concave surface, the sixth lens L6 is a biconvex lens, the seventh lens L7 is a biconvex lens, the eighth lens L8 is a biconcave lens, the ninth lens L9 is a biconvex lens, and the image-side surface of the tenth lens L10 is a convex surface.
In the present invention, the seventh lens element L7 and the eighth lens element L8 are cemented together to form a cemented lens group having a negative refractive power.
In the present invention, a stop STO is further included, and the stop STO is positioned between the fifth lens L5 and the sixth lens L6.
In the present invention, the focal length f4 of the fourth lens L4 and the focal length f6 of the sixth lens L6 satisfy the following relationship: the absolute value of f4/f6 is more than or equal to 0.60 and less than or equal to 1.00, so that the imaging quality can be effectively improved by reasonably distributing the optical power. The aperture D1 of the first lens L1 and the total length T of the prime lens satisfy the following relationship: D1/T is more than or equal to 0.48 and less than or equal to 0.60. Therefore, the size of the fixed-focus lens can be effectively reduced, and miniaturization is realized.
In the present invention, the refractive index n1 of the first lens L1 is greater than 1.65, so that the lens aperture can be reduced and the influence of distortion can be reduced. The abbe number vd4 of the fourth lens L4 is less than 30, and the abbe number vd10 of the tenth lens L10 is less than 25, that is, chromatic aberration of an image is corrected using an anomalous dispersion material. The abbe number vd7 of the seventh lens L7 is larger than 80, so that the dispersion of the lens can be improved. The refractive index n8 of the eighth lens L8 is greater than 1.80, so that tolerance sensitivity can be reduced, and yield can be improved. At least four surfaces in the fixed-focus lens are aspheric surfaces, so that aberration can be corrected by utilizing multivariate of the aspheric surfaces, and the performances of high-temperature and low-temperature environments are balanced.
In summary, the lens barrel of the present invention corrects image distortion by reasonably distributing the powers of the lenses and setting the two surfaces of the second lens L2 to be aspheric surfaces, so that the image distortion degree is small and the restoration is more realistic. In addition, the spherical lens and the aspheric lens are combined for use, so that the performance of the lens is further improved, and the resolution can reach 4 k. The height of the image plane of the fixed-focus lens can reach phi 6.4mm, so that the application prospect is wide, and the market competitiveness is stronger. In addition, the lens can not be virtual burnt within the temperature range of-20 ℃ to 60 ℃, so that the lens can still be used within a large temperature range. And the lens can realize image capture with a horizontal field angle larger than 100 degrees. The total optical length of the fixed-focus lens is less than or equal to 25.30mm (including protective flat glass L11), so that the volume of the fixed-focus lens is small. The single part of the lens is easy to process, manufacture and assemble.
In the following three embodiments, the surfaces of each optical element and the image plane IMA in the fixed focus lens are represented by S1, S2, … and SN, wherein the cemented surface of the cemented lens group is represented as one surface, and the aspheric plastic lens satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
First embodiment
Referring to fig. 1 to 5, in the present embodiment, each parameter of the fixed-focus lens is F #: 2.00; total lens length: 25.11 mm; diagonal angle of view: 123.00 deg. Moreover, the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens group, thereby achieving a good function of eliminating chromatic aberration.
The relevant parameters of each lens of the fixed-focus lens of the present embodiment include surface type, curvature radius, thickness, refractive index of the material, and abbe number, as shown in table 2 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 20.46 | 1.00 | 1.69 | 54.6 |
| S2 | Spherical surface | 5.14 | 1.34 | ||
| S3 | Aspherical surface | 14.81 | 1.20 | 1.54 | 56.0 |
| S4 | Aspherical surface | 3.07 | 1.83 | ||
| S5 | Aspherical surface | -23.02 | 1.06 | 1.54 | 56.0 |
| S6 | Aspherical surface | 4.99 | 0.67 | ||
| S7 | Spherical surface | 6.10 | 2.01 | 1.76 | 27.5 |
| S8 | Spherical surface | -6.36 | 0.91 | 1.50 | 81.6 |
| S9 | Spherical surface | 14.53 | 2.51 | ||
| S10(STO) | Spherical surface | Infinity | 0.57 | ||
| S11 | Aspherical surface | 4.88 | 1.34 | 1.59 | 61.3 |
| S12 | Aspherical surface | -26.20 | 0.10 | ||
| S13 | Spherical surface | 3.52 | 1.88 | 1.50 | 81.6 |
| S14 | Spherical surface | -2.56 | 0.50 | 2.00 | 25.4 |
| S15 | Spherical surface | 7.44 | 0.24 | ||
| S16 | Aspherical surface | 17.73 | 1.21 | 1.54 | 56.0 |
| S17 | Aspherical surface | -5.13 | 0.54 | ||
| S18 | Aspherical surface | -24.27 | 2.20 | 1.64 | 23.5 |
| S19 | Aspherical surface | -3.89 | 0.24 | ||
| S20 | Spherical surface | Infinity | 0.80 | 1.52 | 64.2 |
| S21 | Spherical surface | Infinity | 2.96 | ||
| S22(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
The aspherical surface coefficients of the aspherical lenses in the present embodiment are shown in table 3 below:
TABLE 3
Where K is the conic constant of the surface, A4、A6、A8、A10、A12、A14The aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order and fourteen order.
Second embodiment
Referring to fig. 6 to 10, in the present embodiment, each parameter of the fixed-focus lens is F #: 2.00; total lens length: 24.78 mm; diagonal angle of view: 119.23 deg.
The parameters related to each lens of the fixed focus lens according to the present embodiment include surface type, curvature radius, thickness, refractive index of the material, and abbe number, as shown in table 4 below:
TABLE 4
The aspherical surface coefficients of the aspherical lenses in the present embodiment are shown in table 5 below:
TABLE 5
Where K is the conic constant of the surface, A4、A6、A8、A10、A12、A14The aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order and fourteen order.
Third embodiment
Referring to fig. 11 to 15, in the present embodiment, each parameter of the fixed-focus lens is F #: 2.00; total lens length: 25.26 mm; diagonal angle of view: 125.93 deg. Moreover, the third lens L3 and the fourth lens L4 are cemented together to form a cemented lens group, thereby achieving a good function of eliminating chromatic aberration.
The relevant parameters of each lens of the fixed-focus lens of the present embodiment include surface type, curvature radius, thickness, refractive index of the material, and abbe number, as shown in table 6 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 11.27 | 0.90 | 1.80 | 46.6 |
| S2 | Spherical surface | 7.18 | 2.00 | ||
| S3 | Aspherical surface | 12.20 | 1.02 | 1.54 | 55.7 |
| S4 | Aspherical surface | 2.01 | 2.99 | ||
| S5 | Spherical surface | -7.46 | 1.11 | 1.50 | 81.6 |
| S6 | Spherical surface | 4.60 | 2.98 | 1.72 | 29.5 |
| S7 | Spherical surface | -9.88 | 0.28 | ||
| S8 | Aspherical surface | -5.64 | 1.90 | 1.54 | 55.7 |
| S9 | Aspherical surface | -12.06 | 0.12 | ||
| S10(STO) | Spherical surface | Infinity | 0.42 | ||
| S11 | Spherical surface | 5.73 | 1.50 | 1.50 | 81.6 |
| S12 | Spherical surface | -3.93 | 0.77 | ||
| S13 | Spherical surface | 17.64 | 1.59 | 1.50 | 81.6 |
| S14 | Spherical surface | -2.89 | 0.50 | 1.85 | 23.8 |
| S15 | Spherical surface | 10.14 | 0.35 | ||
| S16 | Aspherical surface | 10.92 | 0.98 | 1.54 | 55.7 |
| S17 | Aspherical surface | -15.51 | 0.26 | ||
| S18 | Aspherical surface | 40.75 | 2.15 | 1.64 | 23.5 |
| S19 | Aspherical surface | -4.75 | 0.35 | ||
| S20 | Spherical surface | Infinity | 0.80 | 1.52 | 64.2 |
| S21 | Spherical surface | Infinity | 2.29 | ||
| S22(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
The aspherical surface coefficients of the aspherical lenses in the present embodiment are shown in table 7 below:
TABLE 7
Where K is the conic constant of the surface, A4、A6、A8、A10、A12、A14The aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order and fourteen order.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A fixed focus lens includes, in order from an object side to an image side along an optical axis, a first lens (L1) having negative power, a second lens (L2) having negative power, a third lens (L3) having negative power, a fourth lens (L4) having positive power, a fifth lens (L5) having negative power, a sixth lens (L6) having positive power, a seventh lens (L7) having positive power, an eighth lens (L8) having negative power, a ninth lens (L9) having positive power, and a tenth lens (L10) having positive power.
2. The prime lens according to claim 1, wherein the first lens (L1) is a convex-concave lens, the second lens (L2) is a convex-concave lens, the third lens (L3) is a biconcave lens, the fourth lens (L4) is a biconvex lens, the object-side surface of the fifth lens (L5) is a concave surface, the sixth lens (L6) is a biconvex lens, the seventh lens (L7) is a biconvex lens, the eighth lens (L8) is a biconcave lens, the ninth lens (L9) is a biconvex lens, and the image-side surface of the tenth lens (L10) is a convex surface.
3. The prime lens according to claim 1, wherein the seventh lens (L7) and the eighth lens (L8) are cemented to constitute a cemented lens group having a negative optical power.
4. The prime lens according to claim 3, wherein the fourth lens (L4) and the fifth lens (L5) are cemented to form a cemented lens group.
5. The prime lens according to claim 3, wherein the third lens (L3) and the fourth lens (L4) are cemented to form a cemented lens group.
6. The prime lens according to claim 1, further comprising a Stop (STO) located between the fifth lens (L5) and the sixth lens (L6).
7. The prime lens according to any one of claims 1 to 6, wherein a focal length f4 of the fourth lens (L4) and a focal length f6 of the sixth lens (L6) satisfy the following relationship: the absolute value of f4/f6 is more than or equal to 0.60 and less than or equal to 1.00.
8. The prime lens according to any one of claims 1 to 6, wherein the aperture D1 of the first lens (L1) and the total length T of the prime lens satisfy the following relationship: D1/T is more than or equal to 0.48 and less than or equal to 0.60.
9. The prime lens according to any one of claims 1 to 6, wherein the refractive index n1 of the first lens (L1) is greater than 1.65.
10. Prime lens according to any of claims 1 to 6, characterized in that the Abbe number vd4 of the fourth lens (L4) is smaller than 30.
11. A prime lens according to any one of claims 1 to 6, wherein the abbe number vd7 of the seventh lens (L7) is greater than 80.
12. Prime lens according to any of claims 1 to 6, characterized in that the refractive index n8 of the eighth lens (L8) is greater than 1.80.
13. A prime lens according to any one of claims 1 to 6, wherein the abbe number vd10 of the tenth lens (L10) is less than 25.
14. A prime lens according to any of claims 1 to 6, wherein at least four surfaces are aspheric.
15. The prime lens according to any one of claims 1 to 6, wherein the object-side surface and the image-side surface of the second lens (L2) are both aspheric.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113805317A (en) * | 2021-10-18 | 2021-12-17 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113805317A (en) * | 2021-10-18 | 2021-12-17 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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